US6349130B1 - Method to pre-qualify copper loops for ADSL service - Google Patents

Method to pre-qualify copper loops for ADSL service Download PDF

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Publication number
US6349130B1
US6349130B1 US09/218,970 US21897098A US6349130B1 US 6349130 B1 US6349130 B1 US 6349130B1 US 21897098 A US21897098 A US 21897098A US 6349130 B1 US6349130 B1 US 6349130B1
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Prior art keywords
high speed
communication link
service
test unit
trunk
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Expired - Lifetime
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US09/218,970
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English (en)
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Carl R. Posthuma
Albert J. Sawyer
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RPX Corp
Nokia USA Inc
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Lucent Technologies Inc
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Priority to US09/218,970 priority Critical patent/US6349130B1/en
Assigned to LUCENT TECHNOLOGIES INC. reassignment LUCENT TECHNOLOGIES INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAWYER, ALBERT J., POSTHUMA, CARL R.
Priority to CA002289342A priority patent/CA2289342C/en
Priority to EP99309849A priority patent/EP1014658B1/de
Priority to DE69921282T priority patent/DE69921282T2/de
Priority to KR1019990057809A priority patent/KR100629096B1/ko
Priority to JP36359099A priority patent/JP3649979B2/ja
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Publication of US6349130B1 publication Critical patent/US6349130B1/en
Assigned to CREDIT SUISSE AG reassignment CREDIT SUISSE AG SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALCATEL-LUCENT USA INC.
Assigned to ALCATEL-LUCENT USA INC. reassignment ALCATEL-LUCENT USA INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CREDIT SUISSE AG
Assigned to NOKIA USA INC. reassignment NOKIA USA INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PROVENANCE ASSET GROUP HOLDINGS, LLC, PROVENANCE ASSET GROUP LLC
Assigned to CORTLAND CAPITAL MARKET SERVICES, LLC reassignment CORTLAND CAPITAL MARKET SERVICES, LLC SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PROVENANCE ASSET GROUP HOLDINGS, LLC, PROVENANCE ASSET GROUP, LLC
Assigned to PROVENANCE ASSET GROUP LLC reassignment PROVENANCE ASSET GROUP LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALCATEL LUCENT SAS, NOKIA SOLUTIONS AND NETWORKS BV, NOKIA TECHNOLOGIES OY
Anticipated expiration legal-status Critical
Assigned to ALCATEL-LUCENT USA INC. reassignment ALCATEL-LUCENT USA INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: LUCENT TECHNOLOGIES INC.
Assigned to NOKIA US HOLDINGS INC. reassignment NOKIA US HOLDINGS INC. ASSIGNMENT AND ASSUMPTION AGREEMENT Assignors: NOKIA USA INC.
Assigned to PROVENANCE ASSET GROUP HOLDINGS LLC, PROVENANCE ASSET GROUP LLC reassignment PROVENANCE ASSET GROUP HOLDINGS LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: NOKIA US HOLDINGS INC.
Assigned to PROVENANCE ASSET GROUP HOLDINGS LLC, PROVENANCE ASSET GROUP LLC reassignment PROVENANCE ASSET GROUP HOLDINGS LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CORTLAND CAPITAL MARKETS SERVICES LLC
Assigned to RPX CORPORATION reassignment RPX CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PROVENANCE ASSET GROUP LLC
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H04M3/307—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using ringback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H04M3/305—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop testing of physical copper line parameters, e.g. capacitance or resistance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/32—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for lines between exchanges
    • H04M3/323—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for lines between exchanges for the arrangements providing the connection (test connection, test call, call simulation)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/05—Aspects of automatic or semi-automatic exchanges related to OAM&P
    • H04M2203/055—Aspects of automatic or semi-automatic exchanges related to OAM&P loopback testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/002—Applications of echo suppressors or cancellers in telephonic connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2209—Arrangements for supervision, monitoring or testing for lines also used for data transmission

Definitions

  • This invention relates to high speed services, and more particularly, to methods for testing communication links for high speed services.
  • XDSL is a digital connection to a location of a customer (a.k.a. user) over standard, single twisted pair, wiring that is already connected to most premises.
  • XDSL promises to transmit large data files to the premises of users for computer, video and other large data operation in a fast and efficient manner.
  • There are many different types of XDSL services such as asymmetrical digital subscriber line (ADSL), high bit rate digital subscriber line (HDSL), high bit rate digital subscriber line-2 (HDSL-2), symmetric digital subscriber line (SDSL), very high speed digital subscriber line (VDSL), ADSL-lite, and other similar high speed digital services. Additionally, there are other non-digital high speed transmission techniques.
  • CPE customer premises equipment
  • PBX private branch exchange
  • MLT provides computer control of accurate and extensive loop testing functions in the user contact, screening, testing, dispatch and close-out phases of trouble report handling. MLT also provides full diagnostic outputs instead of just pass and fail indications.
  • a test unit is connected to one end (first end) of a communication link.
  • a call is then made from a communication unit, located at a test facility, at the first end of the communication link to CPE located at a second end of the communication link.
  • the CPE receives the call at the second end of the communication link and then terminates the call.
  • the test unit tests the communication link within a time interval after the CPE terminates the call.
  • FIG. 1 is a functional block diagram of the implementation of the method for performing the high speed service tests by a test facility
  • FIG. 2 is a logic flow chart showing the steps of the process performed by the test facility.
  • a test facility 100 is shown implementing a high speed service (such as XDSL or a high speed analog service) test for a communication line 105 of a potential user.
  • Communication line 105 is also connected at one end 110 to customer premises equipment (CPE) 115 (CPE generally relates to any telephonic equipment such as telephones, key systems, PBX, answering machines, etc.) of the potential user.
  • CPE customer premises equipment
  • FIG. 1 also shows that the communication line 105 is connected to a switch 120 located at a central office 125 .
  • the switch 120 is any commercially available telecommunication switch which will allow the central office 125 to communicate to a plurality of CPEs.
  • An example of a switch 125 is a 5ESS telephonic switch produced by Lucent Technologies, Inc.
  • a second communication line referred to as a data line 130
  • a data line 130 is shown to connect the switch 120 , at the central office 125 , to a test unit 135 and a communication device 140 , at a connection point 145 of the data line 130 , located at the test facility 100 .
  • a communication link is established between the test facility 100 and the CPE 115 via data line 130 , communication line 105 , and switch 120 .
  • the combination of the electrical paths from the connection point 145 of data line 130 to the end 110 of the communication line 105 through the switch 120 establish the communication link.
  • the connection point 145 of the data line 130 is herein referred to as the first end 145 of the communication link and the end 110 of the communication line 105 is referred to as the second end 110 of the communication link.
  • Additional CPEs are shown connected to the switch 120 through communication lines 160 and 165 respectively.
  • the invention will work equally well for a plurality of CPEs and communication lines without limitation as the switch 120 is enabled to communicate with multiple CPEs.
  • the communication line 105 is preferably a standard telephone line such as a single twisted pair line. However, it is appreciated that other non-standard telephone lines such as non-twisted pair, multiple twisted pair, coaxial, fiber optic, microwave or millimeter lines may suitably be employed.
  • the communication line 105 is controlled by a central office 125 .
  • a service provider associated with the telephonic central office 125 owns, maintains and controls the communication lines 105 , 160 , 165 coupled with switch 120 .
  • the central office 125 has full access to the communication line 105 and performs metallic loop access testing on the communication line 105 .
  • the central office 125 of FIG. 1 is shown with a mechanized loop testing (MLT) 170 block and the switch 120 block.
  • the MLT 170 block represents the MLT testing units at the central office 125 .
  • the MLT units 170 are physically connected to the communication line 105 through the switch 120 .
  • the test facility 100 is shown to posses the test unit 135 and the communication device 140 connected to the data line 130 via the first end 145 of the communication link.
  • the data line 130 is preferably a T-1 trunk line.
  • a trunk is a communication line between two switching systems such as equipment in the central office 125 and the test facility 100 .
  • the T-1 line is preferably a dual twisted pair digital transmission link with a transmission capacity of 1,544,000 bits per second.
  • the data line 130 may selectively be any high speed digital line that is compatible with the central office 125 such as primary rate interface (PRI).
  • PRI is the integrated service digital network (ISDN) equivalent of a T-1 line.
  • ISDN integrated service digital network
  • the data line 130 may selectively also be a whole network or part of network which includes several switches and/or different types of transmission equipment.
  • a non-digital line may also be employed as a data line 130 .
  • analog type line the electrical properties inherent in all analog trunks will be employed.
  • communication device 140 located at the test facility 100 either initiates or receives a call from the CPE 115 . If the user of the CPE 115 wishes to know if the communication line 105 is capable of supporting high speed service then the test facility 100 connects the test unit 135 to the data line 130 and the communication device 140 (either automatically or in response to user interaction) instructs the CPE 115 to terminate the call (such as hanging up a telephone). Once the CPE 115 terminates the call, the test facility 100 begins the high speed testing with the test unit 135 .
  • the high speed service testing preferably takes place within a pre-selected time interval such as a ten second time interval after the CPE 115 terminates the call.
  • a pre-selected time interval such as a ten second time interval after the CPE 115 terminates the call.
  • telephone lines stay active and connected :or approximately ten seconds after a telephone is hung up (before the switch network at the central office 125 disconnects the call.)
  • the specification for the time interval is described in Bellcore specification GR-505-CORE section 5.4.1.3 R5-22 [214], herein incorporated by reference.
  • the test unit 135 While testing, the test unit 135 propagates electromagnetic energy waves (signals) from the first end 145 to the second end 110 of the communication link. When the waves reach the second end 110 of the communication link the waves are then reflected back to the test unit 135 at the first end 145 of the communication link. Once the reflected waves are received by the test unit 135 , the test unit 135 analyzes the reflected waves in relation to the propagated waves and determines the electrical properties of the communication link such as calculating the frequency properties of the loop. The test unit 135 calculates the channel capacity of the communication link divided in either asymmetrical and symmetrical upstream and downstream rates for the communication link. The test unit 135 then records the various electrical properties of the communication link for future use. It is appreciated that the recorded data from the test unit 135 may selectively be stored in a memory unit located either within or external to the test unit 135 .
  • the autocut function is preferably disabled by either the test unit 135 or the central office 125 of FIG. 1 .
  • the autocut function is a function that prevents oscillations when the CPE 115 goes on-hook (i.e. the CPE 115 terminates the call).
  • the recorded data may selectively include the loop length, line load impedance, the presence of loading coils and analog frequency performance.
  • the test unit 135 also records whether the communication link supports a high speed service and the upstream and downstream rates of the communication link both for digital and/or analog transmission. Once this information is recorded the test facility 100 determines if a high speed service may be supported which in a digital case supports XDSL and in an analog case selectively supports one or more of the following: television transmissions, music, voice, multiplexed voice, image and/or video transmission.
  • test unit 135 is the Lucent Technologies, Inc. Remote Measurement System—Digital unit (RMS-D), however, other manufactures also produce similar units. These units are preferably digital signal processing (DSP) based and are selectively updated with new firmware to perform multiple tests. While there are several alternatives to measuring and calculating the electrical properties of the communication link the following two example tests selectively provide the test data to the test unit 135 .
  • RMS-D Remote Measurement System—Digital unit
  • DSP digital signal processing
  • a four wire return loss measurement is selectively used to determine the approximate length of the communication link loop when the CPE 115 is on-hook.
  • a sweep of the frequency while looking at the returned signals is selectively used to determine the presence of loading coils. If this test indicates the presence of loading coils, the loading coils are selectively removed in a later operation.
  • the loop If the return loss of the first test is low, the loop is short and supports very high data rates. If the return loss of the first test is high, the loop is long and selectively supports high data rates. A mapping is selectively generated from the return loss results versus the data rates.
  • the upstream or downstream asymmetric data rates for ADSL, ADSL Lite and VDSL are selectively mapped to the return loss values via correlation between the loop lengths and performance values as given in the XDSL standards.
  • the symmetric bit rates for HDSL, HDSL-2 and symmetric VDSL are selectively mapped to return loss values via correlation between loop lengths and the performance values given in the XDSL standards.
  • step 180 the test facility 100 of FIG. 1 connects the test unit 135 to the data line 130 at the first end 145 .
  • a call is made by either the CPE 115 or the communication device 140 .
  • decision step 185 FIG. 2 if the CPE 115 of FIG. 1 calls the test facility 100 , the process continues to step 190 .
  • step 190 FIG. 2, the communication device 140 , FIG. 1, instructs the CPE 115 that the communication device 140 will call the CPE 115 back.
  • step 195 If instead, the communication device 140 calls the CPE 115 , the process continues directly to step 195 .
  • step 195 the communication device 140 , FIG. 1, calls the CPE 115 which answers the call in step 200 .
  • the communication device 140 then instructs the CPE 115 , in step 205 , to terminate the call, which the CPE 115 does in step 210 .
  • the communication device 140 determines in decision step 215 if there is echo canceling capabilities on the communication link. If there is echo canceling capabilities on the communication link, decision step 215 then sends the process to step 220 that disables the echo canceling capabilities of the communication link.
  • step 225 the test facility 100 , FIG. 1, begins testing the communication link with the test unit 135 . If there is no echo canceling on the communication link, the process then continues to step 225 , FIG. 2, directly and the test facility 100 , FIG. 1, begins testing the communication link with the test unit 135 .
  • step 230 the process then records any test data that the test unit 135 , FIG. 1, needs in order to determine performance of the communication link.
  • the test unit 135 determines whether the communication link is high speed service capable and then, if capable of supporting high speed service, the test unit 135 determines the upstream and downstream rates of the communication link. The process ends at 235 .

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
US09/218,970 1998-12-22 1998-12-22 Method to pre-qualify copper loops for ADSL service Expired - Lifetime US6349130B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US09/218,970 US6349130B1 (en) 1998-12-22 1998-12-22 Method to pre-qualify copper loops for ADSL service
CA002289342A CA2289342C (en) 1998-12-22 1999-11-10 Method to pre-qualify copper loops for adsl service
EP99309849A EP1014658B1 (de) 1998-12-22 1999-12-07 Verfahren zum vor-Kennzeichnen der kupfernen Schleifen eines ADSL Dienstes
DE69921282T DE69921282T2 (de) 1998-12-22 1999-12-07 Verfahren zum vor-Kennzeichnen der kupfernen Schleifen eines ADSL Dienstes
KR1019990057809A KR100629096B1 (ko) 1998-12-22 1999-12-15 고속 서비스를 위한 통신 링크를 테스트하기 위한 방법
JP36359099A JP3649979B2 (ja) 1998-12-22 1999-12-22 Ａｄｓｌサービス用に銅ループを予め適応させる方法

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Application Number Priority Date Filing Date Title
US09/218,970 US6349130B1 (en) 1998-12-22 1998-12-22 Method to pre-qualify copper loops for ADSL service

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US6349130B1 true US6349130B1 (en) 2002-02-19

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EP (1) EP1014658B1 (de)
JP (1) JP3649979B2 (de)
KR (1) KR100629096B1 (de)
CA (1) CA2289342C (de)
DE (1) DE69921282T2 (de)

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US20020126207A1 (en) * 1999-05-28 2002-09-12 Qwest Communications International, Inc. VDSL video/data set top test equipment
US6466647B1 (en) * 1999-11-17 2002-10-15 Bellsouth Intellectual Property Corporation System and method for estimating the capacity of a local loop to carry data
US20020176542A1 (en) * 2001-05-22 2002-11-28 Lazarus David B. Method and apparatus for performing either tone analysis on a local looped-back communications path or utilizing a hybrid reflection based looped-back test to test integrity
US6496566B1 (en) * 2000-09-29 2002-12-17 Lucent Technologies Inc. Metallic testing of a subscriber loop that provides both voice and digital subscriber line services
US6519320B2 (en) * 2000-08-30 2003-02-11 Nec Corporation State monitoring method and apparatus in subscriber line test
US20030218984A1 (en) * 2002-05-22 2003-11-27 Nec Corporation Communication system multiplexer included in the system, line performance test method and recording medium having program recorded thereon
US6687336B1 (en) * 1999-09-30 2004-02-03 Teradyne, Inc. Line qualification with neural networks
US20040028189A1 (en) * 2000-10-19 2004-02-12 Bauer Frank R. Method and apparatus for bridged tap impact analysis
US20040062360A1 (en) * 2002-09-30 2004-04-01 Holeva Lee F. Speed binning by neural network
US20040114527A1 (en) * 2000-07-19 2004-06-17 Roger Faulkner Method of performing insertion loss estimation
US20040120470A1 (en) * 2002-12-23 2004-06-24 Sbc Properties, L.P. Equivalent working length determinative system for digital subscriber line circuits
US6834099B1 (en) * 2002-09-19 2004-12-21 Sprint Communications Company L.P. End-user communications test system
US6865256B1 (en) * 1999-12-21 2005-03-08 Alcatel Method and apparatus for determining properties of a transmission channel
US20050069029A1 (en) * 2003-09-26 2005-03-31 Teradyne, Inc. Method and apparatus for identifying faults in a broadband network
US20050094785A1 (en) * 2000-03-03 2005-05-05 Teradyne, Inc. Technique for estimation of a subscriber line insertion loss
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US20050135567A1 (en) * 1999-06-23 2005-06-23 Teradyne, Inc. Qualifying telephone lines for data transmission
US20110188514A1 (en) * 2010-02-04 2011-08-04 Peter Bradley Schmitz Method and apparatus for automated subscriber-based tdm-ip conversion

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DE69921282T2 (de) 2005-11-03
CA2289342A1 (en) 2000-06-22
EP1014658B1 (de) 2004-10-20
KR20000052478A (ko) 2000-08-25
DE69921282D1 (de) 2004-11-25
CA2289342C (en) 2004-10-19
EP1014658A3 (de) 2002-05-08
KR100629096B1 (ko) 2006-09-28
JP2000209338A (ja) 2000-07-28
EP1014658A2 (de) 2000-06-28
JP3649979B2 (ja) 2005-05-18

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